Improvement in pitmen



H. ESSEX.

Pitman.

No. 197,71() Paten'ted Dec. 4,1877.

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\N. PETERS, PHOTO-LlTHOGRAPHB. WASHINGTON, U. U.

-UNITED STATES PATENT OEEIGE.

HENRY ESSEX, OF MEADVILLE, PENNSYLVANIA.

llvlPRovlalvu-:NTl IN PITMEN.

Specification forming part of Letters Patent No. 197,770, dated December4, 1877; application filed November 15, 1877.

To all whom it may concern:

Be it known that I, HENRY EssEx, otMeadville, county of Crawford, Stateof Pennsylvania, have invented certain new and useful Improvements inConnecting-Rods, of which the following is a full, clear, and exactdescription, reference being had to the accompanying drawings, making.part of this speciiication, in which- Figure l represents a sideelevation of my improved connecting-rod. Fig. 2 represents longitudinalsection through said rod; and Fig. 3 is a transverse section of thesame, taken on line .r a", Fig. 2.

Similar letters of reference denote corresponding parts in all thefigures.

My invention relates to a novel construction of pitman or connectingrod, whereby increased strength and stiifness are obtained with areduced amount of metal, and Whereby, also, the adjustment or tighteningof its boxes upon the wrists or pins with which it is connected isfacilitated; and it consists in making the rod double, or consisting oftwo rods passing through the ends of the boxes on opposite sides of thebearing or eye, and provided with threaded ends, and with sleevesintermediate between the boxes, whereby, by means of nuts,the boxes maybe tightened, as hereinafter explained;

In the accompanying drawings, A A' represent two rods, placed inparallel lines, their ends passing through perforations in the oppositeends of the divided boxes B B', at right angles to the eye or seat Gtherein, for the reception of the wrist or pin withwhich the pitman istobe connected. The ends of these rods are threaded at a a, at one orboth ends, as may be preferred. Where they are threaded to receive nutsb b' at one end only, the opposite ends will have heads formed uponthem,

against which the box at that end will rest,

`being slipped upon the rods from the opposite end. The boxes B B' aremade in two parts, or divided transversely in line with the eye orbearing C, for facilitating their application to or removal from thewrist or pin, and are held at the required distance apart on the rods bymeans of sleeves E, of the required length, surrounding the rods A A'intermediate between the boxes.

i The nuts at one end being backed'oif or removed, the two parts ofthe'divided boxes are allowed to separate sufficiently to allow the` box tobe placed on the wrist or pins with which the pitman is to be connected,when, by tightening the nuts b, the two parts of both boxes willbe'drawn together simultaneously, each upon its respective wrist or pin,the sleeves E E holding the inner half of each box up against the actionof the clampin g-nuts, or nuts and heads.

By the arrangement of parts as shown and described, it will be seen thatthe pitman or connecting rod is not only adapted to be readily appliedor removed, but wear in the boxes may be compensated for by thetightening of the nuts, thus drawing the parts of the box more snuglytogether.

The sleeves E E' give great stiffness to the rod, and permit theemployment of much ylighter'through-rods, A, than could otherwise beused, while the employment of the two rods, one on each side of the eye,for the reception of the pin or wrist, permits an adjustment fordistributing the take-up, and for compensating for any unevenness in thewear upon the boxes. i

'Ihe jam-nuts b' serve to prevent any accidental backing or loosening ofthe clampingnuts b.

By the construction shown and described I make a strong and durableconnecting-rod, adapted to any of the various uses to whichconnecting-rods are applied.

Having now described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

l. In a connecting-rod, the parallel rods A A', provided with the tubesor sleeves intermediate between the boxes B B', and with theclamping-nuts or their equivalents, substantially as and for the purposedescribed.

2. The combination of the two rods A A', divided boxes B B', sleeves EE', and nuts b b', arranged and operating substantially as and for thepurpose set forth.

f HENRY ESSEX.

Witnesses:

JAMES HAZLET, JOHN D. HAZLET.

